Sitting on the saddle.

[gavroche]

While watching the TDF, I noticed that many riders actually sit at the front of their saddle. Is it more comfortable that way or do they do it only for a few minutes to relieve pressure on their backside?

 

[Crackle]

If you're putting in the effort you just naturally drift forward onto the saddle nose.

 

[roubaixtuesday]

See also "on the rivet"

https://www.urbandictionary.com/define.php?term=on the rivet